Welsh middle name for Evelyn

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My husband and I would like to choose a Welsh middle name (he's Welsh!), and we've decided on Evelyn as the first name. Any suggestions of good combinations? They all sound a bit clunky when I try and put them together!

Which pronunciation of Evelyn are you using? Eve-lyn, Ev-uh-lin or Ev-lin?

Evelyn Nia
Evelyn Ffion
Evelyn Nerys
Evelyn Megan
Evelyn Mari/Mair
Evelyn Mali
Evelyn Tesni
Evelyn Teleri
Evelyn Meleri
Evelyn Haf (this is a common middle name in Wales, as is Mai)

Thanks so much for all the info @ArseyWelshNameBore I've been wary of the lists! I think we're leaning towards Nia.

We're going with Ev-Ur-Lyn @CaffiSaliMali

Mari
Rhian
Anwen
Alaw
Gwenllian
Megan
Seren
Cadi
Mabli
Carys
Elin

If you wanted a Welsh first name instead of Evelyn then you might like Efa.